TY JOUR TI IMPACT OF PLANT BIOMASS AND MAIN TILLAGE METHODS ON THE AGROPHYSICAL PARAMETERS OF THE SOIL AND PRODUCTIVITY OF CULTURES AT A CROP ROTATION KW addition density KW structural-aggregate composition KW lumpiness KW soil porosity KW yield JO Vestnik of Kazan State Agrarian University AU Akhmetzyanov, M.R. AU Huzina, G.K. AU Talanov, I.P. PY 2019 IS 14 PB Kazan state agrarian University